However, Yahoo and Microsoft added a clause in April allowing the partnership to be broken early. Consequently, the first day the deal could be cut short was the same day Yahoo's deal with Google began. (Video via Microsoft)

No one's saying Yahoo will break from Microsoft, though, especially since recent rankings put Yahoo's market share at a fairly distant third place.

And even search engine giant Google is taking all the help it can get, with companies like Facebook selling competing ads that use data that search engines can't access. (Videos via Google and Facebook)